Analog Devices Inc. LT1990IMS8-10#PBF

Overview

LT1990IMS8-10#PBF from Analog Devices is a micropower precision difference amplifier with fixed gain of 10, ±250V common-mode input range (at ±15V supply), 100kHz bandwidth, and rail-to-rail output. It features fault protection to ±350V common-mode and ±500V differential transients, 60dB min CMRR, and operates from 2.7V to 36V supply. It is used for high-side current sensing in industrial power supplies and battery management systems.

For engineers reviewing the LT1990IMS8-10#PBF datasheet, LT1990IMS8-10#PBF pinout, LT1990IMS8-10#PBF application, or LT1990IMS8-10#PBF equivalent, key selection criteria include verified ±250V common-mode tolerance at ±15V supply, guaranteed 100kHz –3dB bandwidth, 0.8% max gain error, 180µA max supply current at 5V, and MSOP-8 package compatibility with FMEA-critical layout requirements.

Technical Context

The LT1990IMS8-10#PBF implements a modified difference amplifier topology with on-chip thin-film resistors trimmed for precise G = 10 gain and internal common-mode voltage division by 27. Its input stage uses high-voltage-rated resistive dividers (1MΩ per input) enabling operation far beyond supply rails - up to ±250V CMV on ±15V supplies.

It integrates reference input (REF) for output offset control, supports single-supply (2.7V–36V) and split-supply (±1.35V–±18V) operation, and includes ESD protection on all pins except –IN/+IN. The rail-to-rail output stage maximizes dynamic range, especially critical for low-voltage applications such as 3V battery monitoring.

Key Specifications

Pinout & Package

LT1990IMS8-10#PBF is housed in an 8-lead plastic MSOP (MS8) package, pin FMEA compatible, with 0.65mm pitch and 3.0mm × 3.0mm body size. Thermal resistance θ_JA = 250°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar difference amplifier applications.

Compared with LT6376IMS8#PBF, LT1990IMS8-10#PBF trades 30dB CMRR for 52% lower quiescent current and wider supply range (2.7V vs. 4.5V min), while versus LT1990IS8-10#PBF it offers 33% smaller footprint and improved FMEA compliance via MSOP pin spacing - critical for high-reliability industrial designs.

Availability

LT1990IMS8-10#PBF is available at Aetrix Electronics and suitable for industrial power supplies, battery management systems, and telecom rectifier monitoring requiring stable component supply over extended production lifecycles.

Supply support for LT1990IMS8-10#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LT1990IMS8-10#PBF belongs to Analog Devices' precision high-voltage difference amplifier product line, designed specifically for accurate signal extraction from high-common-mode-voltage circuits in safety-critical and energy-efficient systems.

FAQ

What is the maximum common-mode input voltage supported by the LT1990IMS8-10#PBF?

The LT1990IMS8-10#PBF supports ±250V continuous common-mode input voltage when operated on ±15V supplies. At 5V single supply (V– = 0V), its usable input window is 85V (e.g., –5V to +80V with V_REF = 1.25V). Absolute maximum transient ratings are ±350V common-mode and ±500V differential for 0.1 seconds.

Can the LT1990IMS8-10#PBF operate from a 3V single supply?

Yes, the LT1990IMS8-10#PBF is fully specified for 3V single supply (V+ = 3V, V– = 0V), delivering 60dB min CMRR, 0.8% max gain error, and rail-to-rail output swing. Its minimum supply voltage is 2.7V, and supply current remains below 180µA - making it suitable for low-voltage battery-powered instrumentation.

How does the REF pin function in the LT1990IMS8-10#PBF?

The REF pin in the LT1990IMS8-10#PBF sets the output DC offset: V_OUT = 10·(V_+IN – V_–IN) + V_REF. It must be driven from a low-impedance source (<5Ω) - such as a precision reference IC or op-amp buffer - to maintain CMRR and gain accuracy. Floating or high-Z connections degrade performance.

Is the LT1990IMS8-10#PBF pin-compatible with other members of the LT1990 family?

Yes, the LT1990IMS8-10#PBF shares identical pinout and package dimensions with LT1990IMS8-1#PBF (G = 1) and LT1990IMS8-50#PBF (G = 50), enabling drop-in gain scaling on the same PCB layout. All variants use the same MSOP-8 footprint and pin functions, simplifying design reuse and variant management.

What thermal considerations apply to the LT1990IMS8-10#PBF in MSOP-8 package?

The LT1990IMS8-10#PBF in MSOP-8 has θ_JA = 250°C/W. At max 375µA supply current and ±15V supply, power dissipation is ~11.25mW - resulting in <3°C junction rise above ambient under typical conditions. For high-temperature industrial use (>85°C ambient), ensure adequate copper pour and avoid enclosing the device in sealed enclosures without airflow.